1. acetic acid and citric acid
2. Acids are corrosive in nature. Strong acids can corrode even metals like iron and aluminium. Hence, acids are not stored in metal containers.
3. litmus paper and methyl orange; acid-base indicators
4. neutralization reaction, salt
5. Organic acids are naturally occurring acids that are present in animal and plant products. They are normally weak acids. Hydrochloric acid, sulphuric acid and nitric acid are known as mineral acids. They are normally strong acids.
P. 72 Oral Questions For Formative Assessment
1. Bases which are soluble in water are called alkalis. But some bases are not soluble in water, so they are not alkalis. That is why all alkalis are bases but all bases are not alkalis.
2. I will not recommend that quicklime or slaked lime be added to the soil to neutralize the acid present in it.
3. sodium hydroxide (NaOH)
4. hydrochloric acid (HCI), magnesium hydroxide is used as an an acid to neutralize the excess add in the stomach
P. 74 Oral Questions For Formative Assessment
1. If we replace hydrogen of an acid with a metal, a salt is formed.
2. a salt and water
3. a. nitric acid
b. carbonic acid
c. hydrochloric acid
d. sulphuric acid
4. a salt; sodium bicarbonate (NaHCO3)
Page 74 For Formative and Summative Assessment
A. 1. d 2.a 3.c 4. d 5. c 6. a 7. d 8. d 9. b
B. 1. sodium chloride 2. an acid 3. red 4. false
5. nitric acid
6. lactic 7. carbon dioxide 8. neutralization 9. sulphuric add 10. alkali
11. ammonium hydroxide
12. a base 13. pale yellow 14. caustic soda 15. magnesium hydroxide
16. true 17. blue
C. 1. The substance which can be used to test if a given substance is acidic or basic in nature is known as an acid-base indicatdr, for example, methyl orange.
2. lemon, antacid, common salt 3. When dilute sulphuric acid is added to zinc, hydrogen gas is produced along with zinc sulphate.
4. Dilute acids react with carbonates such as calcium carbonate (CaCO3) to form salt and carbon dioxide gas.
5. Examples of strong acids: (I) Nitric acid (ii) Sulphuric acid
Examples of weak acids: (i) Lactic acid (ii) Acetic acid
6. Ant bite injects formic acid inside the skin, and thus skin irritates for some time. To get relief, a base (baking soda) is applied to neutralize the acid. The irritation ends with forming salt and water and provides relief.
7th Acids bases and Salt Living science solution